CN113816273B - Crane safety management control system and method - Google Patents
Crane safety management control system and method Download PDFInfo
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- CN113816273B CN113816273B CN202110905906.8A CN202110905906A CN113816273B CN 113816273 B CN113816273 B CN 113816273B CN 202110905906 A CN202110905906 A CN 202110905906A CN 113816273 B CN113816273 B CN 113816273B
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- 238000012937 correction Methods 0.000 claims abstract description 32
- 238000004458 analytical method Methods 0.000 claims abstract description 24
- 238000013500 data storage Methods 0.000 claims abstract description 23
- 238000007726 management method Methods 0.000 claims abstract description 15
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
- B66C15/06—Arrangements or use of warning devices
- B66C15/065—Arrangements or use of warning devices electrical
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Control And Safety Of Cranes (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses a crane safety management control system and method, comprising a data acquisition unit, a control unit, an early warning analysis unit, an auxiliary correction unit, a data storage unit and a region warning unit, wherein the early warning analysis unit is arranged to process wind speed data and lifting data to obtain early warning region data, and the early warning analysis unit is matched to monitor and warn off an intrusion target in an early warning region so as to solve the problem that the early warning range of a crane is artificially determined inaccurately; the auxiliary correction unit is arranged to obtain the stability coefficient of the crane, the load lifting speed and the load descending speed are automatically adjusted by using the comparison result, and meanwhile, the deviation between the actual lifting track and the preset lifting track is judged according to the comparison of the actual lifting speed and the load descending speed, so that the actual lifting speed is adjusted, and the problem that the deviation caused by the cooperation operation of personnel and experience is not corrected is avoided.
Description
Technical Field
The invention relates to a safety management control system, in particular to a crane safety management control system and a crane safety management control method.
Background
The crane is a multi-action hoisting machine for vertically hoisting and horizontally carrying heavy objects in a certain range, and the hoisting machine can also be called hoisting equipment, and is an important tool and equipment for realizing mechanization and automation of production processes in industrial, traffic and building enterprises, reducing heavy physical labor and improving labor productivity.
The hoisting machinery is high in price, potential safety hazards are easy to occur due to the fact that the hoisting machinery is large in working load, personnel and property safety are greatly jeopardized if the hoisting machinery is not found and processed in time, and therefore special personnel are required to check and maintain the crane before and after the hoisting machinery is used. For this purpose, we provide a crane safety management control system and method.
Disclosure of Invention
The invention aims to provide a crane safety management control system and method.
The technical problems solved by the invention are as follows:
(1) How to process wind speed data and lifting data by arranging an early warning analysis unit to obtain early warning area data, and monitoring and warning driving away an invasion target in an early warning area by matching with an area warning unit, so as to solve the problems that the early warning range of a crane is artificially determined to be inaccurate and potential safety hazards are caused by the invasion of irrelevant personnel in a working area in the prior art;
(2) How to calculate the stability factor of the crane by setting the auxiliary correction unit, automatically adjusting the load lifting speed and the load descending speed by using the comparison result, and judging the deviation of the actual lifting track and the preset lifting track according to the comparison of the actual lifting speed and the load descending speed at the same time, thereby adjusting the actual lifting speed and solving the potential safety hazard generated by the fact that the deviation caused by the cooperation operation of personnel and experience in the prior art can not be corrected.
The aim of the invention can be achieved by the following technical scheme: a crane safety management control system comprises a data acquisition unit, a control unit, an early warning analysis unit, an auxiliary correction unit, a data storage unit and an area warning unit;
the data acquisition unit is used for acquiring wind speed data and lifting data and transmitting the wind speed data and the lifting data to the data storage unit for storage, the lifting data comprises lifting load, maximum windward area of the load, preset lifting height, preset lifting speed and preset lifting track, and the preset lifting track represents a path track to be passed by an object from an initial point to a target point;
the data storage unit is pre-stored with specification data of the crane and commander image data, wherein the specification data comprises a load limit value, a load-power-speed comparison table and a vibration frequency limit value;
the early warning analysis unit is used for analyzing the early warning area to obtain a load overweight signal, a wind power alarm signal and early warning area data and sending the load overweight signal, the wind power alarm signal and the early warning area data to the control unit, and the control unit sends an audible and visual alarm when recognizing the load overweight signal and the wind power alarm signal, and meanwhile, the control unit sends the early warning area data to the area warning unit, and the area warning unit receives the early warning area data and warns the early warning area;
the data acquisition unit acquires cable length data, load lifting time, load descending time, working vibration frequency, real-time power and actual lifting speed in real time and sends the cable length data, the load lifting time, the load descending time, the working vibration frequency, the real-time power and the actual lifting speed to the auxiliary correction unit, and the auxiliary correction unit is used for correcting the operation of crane operators, obtaining working condition abnormal signals, braking signals and vibration checking signals and transmitting the working condition abnormal signals, the braking signals and the vibration checking signals to the control unit.
The invention further technically improves that: the specific steps of the early warning analysis unit for early warning area analysis are as follows:
step S21: extracting wind speed data and lifting data from a data storage unit, marking the wind speed data as FS, the lifting load as ZH, the maximum windward area of the load as YS, the preset lifting height as DH and the preset lifting speed as DV;
step S22: comparing the lifting load with a load limit value, when the lifting load is more than or equal to the load limit value, judging that the load exceeds and cannot be successfully lifted, generating a load overweight signal, and when the lifting load is less than the load limit value, judging that the load is normal, and performing no processing, and entering step S23;
step S23: substituting the wind speed data and the maximum windward area of the load into a calculation formula: obtaining windward thrust TF, wherein ρ represents air density and the value is 1.205kg/m3;
step S24: calculating the ratio of the windward thrust to the gravity of the lifted object, presetting a thrust-weight ratio threshold in an early warning analysis unit, judging that the wind power influence is controllable when the ratio result is smaller than or equal to the thrust-weight ratio threshold, entering a step S25, judging that the wind power influence is uncontrollable when the ratio result is larger than the thrust-weight ratio threshold, and generating a wind power alarm signal;
step S25: distance formula according to free falling body movementSubstituting a preset lifting height into a distance formula to obtain free falling time t Falling down Wherein g is the gravity acceleration, substituting windward thrust and lifting load into the calculation formula: windward thrust = craneCarrying out load transportation and acceleration to obtain tangential acceleration a;
step S26: under extreme conditions, after a lifted cable is broken, a lifted object can perform uniform variable-speed linear motion along the tangential direction of the lifting speed at windward thrust, and free falling time, tangential acceleration and lifting speed are substituted into a calculation type:thereby obtaining the horizontal displacement JL of the lifted object after fracture;
step S27: drawing a virtual circle by taking any point on a preset lifting track as a circle center and taking a distance represented by horizontal displacement as a radius, connecting the center with the circle center by taking the bottom of a crane cantilever as the center, extending to intersect with the far-end outline of the circle, marking an intersection point, taking the distance between the center and the intersection point as the radius, taking the center point as the center of an early warning area, establishing a circular area, and integrating the center coordinate point and the radius of the early warning area into early warning area data.
The invention further technically improves that: the regional warning unit comprises a plurality of infrared generators and infrared receivers with equal numbers, the infrared generators and the infrared receivers are arranged on the boundary of a circular early warning region at equal intervals, and the specific steps of regional warning are as follows:
step S31: when the crane is started, the infrared generator transmits infrared rays to the corresponding infrared receiver to form an infrared induction light curtain, so that the early warning area is separated from the external space;
step S32: when the infrared generator works and the corresponding infrared receiver can receive infrared light, no invasion is judged in the early warning area, no processing is carried out, and when the infrared generator works and the corresponding infrared receiver does not receive infrared light, an invasion target appears in an infrared induction light curtain in the early warning area, and a safety early warning signal is generated;
step S33: when the safety early warning signal is identified, a camera is started to acquire a face image, the acquired face image is converted into face image data, commander image data are extracted from a data storage unit and are compared with face influence data, when the comparison is successful, an invasion target is judged to be a ground commander, a safety prompt signal is generated, when the comparison is failed, the invasion target is judged to be a strange target, and a safety warning signal is generated;
step S34: when the safety prompt signal is recognized, no processing is performed, and when the safety alarm signal is recognized, the crane operator is prompted by voice to stop operation, and meanwhile, the ground commander is informed to warn and drive away strange targets.
The invention further technically improves that: the specific steps of the auxiliary correction unit for correction are as follows:
step S41: obtaining cable length data, load lifting time and load descending time, carrying out difference operation on the cable length data at the initial moment of the load lifting time and the cable length data at the final moment of the load lifting time to obtain a length difference value, obtaining a load lifting speed according to the length difference value and the load lifting time, and obtaining the load descending speed in the same way;
step S42: the auxiliary correction unit is preset with a vibration frequency limit value and a stability threshold value, and according to a calculation formula:when the stability coefficient is within the stability threshold, not performing any processing, and when the stability coefficient is outside the stability threshold, performing load lifting or load descending according to the current load lifting speed or the current load descending speed which is reduced by ten percent;
step S43: when the actual lifting speed is less than the preset lifting speed, acquiring a load-power-speed comparison table and real-time power, comparing to obtain a theoretical lifting speed, calculating the ratio of the real-time lifting speed to the theoretical lifting speed to obtain a speed ratio, judging that the current power-speed conversion efficiency is abnormal when the speed ratio is less than a set threshold value, generating a working condition abnormal signal, and when the actual lifting speed is more than the preset lifting speed, judging that the lifting speed is too high, and the actual lifting track exceeds the preset lifting track to generate a brake signal;
step S44: when the working vibration frequency is smaller than the vibration frequency limit value, no processing is performed, and when the working vibration frequency is larger than or equal to the vibration frequency limit value, the working condition of the crane is judged to be unstable, the reliability of the transmission connecting device is low, and a vibration checking signal is generated.
The invention further technically improves that: when the control unit recognizes the abnormal working condition signal and the vibration checking signal, the control unit sends out a corresponding prompt tone to remind a crane operator to stop the machine for checking, and when the control unit recognizes the braking signal, the control unit automatically sends out an electric signal to the driving unit to carry out deceleration correction.
The crane safety management control method comprises the following steps:
step one: the data acquisition unit acquires wind speed data, lifting data and supervision image data and transmits the data to the data storage unit for storage;
step two: the early warning analysis unit extracts wind speed data and lifting data from the data storage unit, calculates and obtains early warning area data by utilizing a theoretical formula, simultaneously generates a load overweight signal and a wind power alarm signal, sends out an audible and visual alarm after being identified by the control unit, simultaneously sends the early warning area data to the area warning unit, and the area warning unit is provided with an infrared generator and an infrared receiver to separate an early warning area from an external space and identify, warn and drive away targets invading the early warning area;
step three: in the process of lifting objects, the auxiliary correction unit obtains the load lifting speed and the load descending speed, compares the stability coefficient, reduces the load lifting speed or the load descending speed when the stability coefficient exceeds the stability threshold, simultaneously calculates and compares the actual lifting speed with the preset lifting speed, correspondingly generates a working condition abnormal signal and a brake signal, generates a vibration check signal through comparing the working vibration frequency with the vibration frequency limit value, and prompts a crane operator and performs stop check after the control unit recognizes the vibration check signal.
Compared with the prior art, the invention has the beneficial effects that:
1. when the crane early warning system is used, the early warning analysis unit extracts wind speed data and lifting data from the data storage unit, calculates the early warning area data by utilizing a theoretical formula, simultaneously generates a load overweight signal and a wind power alarm signal, sends out an acousto-optic alarm after being identified by the control unit, simultaneously sends the early warning area data to the area warning unit, and the area warning unit is provided with the infrared generator and the infrared receiver to separate the early warning area from an external space and identify, warn and drive away targets invading the early warning area.
2. In the process of lifting an object, the auxiliary correction unit obtains the load lifting speed and the load descending speed, compares the stability coefficient, reduces the load lifting speed or the load descending speed when the stability coefficient exceeds the stability threshold, simultaneously calculates and compares the actual lifting speed with the preset lifting speed, correspondingly generates a working condition abnormal signal and a brake signal, generates a vibration check signal through comparing the working vibration frequency with the vibration frequency limit value, prompts a crane operator and carries out stop check after the control unit recognizes, obtains the stability coefficient of the crane through the auxiliary correction unit, and judges the deviation of the actual lifting track and the preset lifting track according to the comparison result of the actual lifting speed and the load descending speed, thereby adjusting the actual lifting speed, avoiding the problem of potential safety hazards caused by incapacity of correction caused by the deviation due to the matching operation of personnel experience, and ensuring the safety and stability of the working condition of the crane.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
Fig. 1 is a system block diagram of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a crane safety management control system includes a data acquisition unit, a control unit, an early warning analysis unit, an auxiliary correction unit, a data storage unit and an area warning unit;
the data acquisition unit is used for acquiring wind speed data and lifting data and transmitting the wind speed data and the lifting data to the data storage unit for storage, the lifting data comprises lifting load, maximum windward area of the load, preset lifting height, preset lifting speed and preset lifting track, and the preset lifting track represents a path track to be passed by an object from an initial point to a target point;
the data storage unit is pre-stored with specification data of the crane and commander image data, wherein the specification data comprises a load limit value, a load-power-speed comparison table and a vibration frequency limit value;
the early warning analysis unit is used for analyzing the early warning area to obtain a load overweight signal, a wind power alarm signal and early warning area data and sending the load overweight signal, the wind power alarm signal and the early warning area data to the control unit, and the control unit sends an audible and visual alarm when recognizing the load overweight signal and the wind power alarm signal, and meanwhile, the control unit sends the early warning area data to the area warning unit, and the area warning unit receives the early warning area data and warns the early warning area;
the data acquisition unit acquires cable length data, load lifting time, load descending time, working vibration frequency, real-time power and actual lifting speed in real time and sends the cable length data, the load lifting time, the load descending time, the working vibration frequency, the real-time power and the actual lifting speed to the auxiliary correction unit, and the auxiliary correction unit is used for correcting the operation of crane operators, obtaining working condition abnormal signals, braking signals and vibration checking signals and transmitting the working condition abnormal signals, the braking signals and the vibration checking signals to the control unit.
The specific steps of the early warning analysis unit for early warning area analysis are as follows:
step S21: extracting wind speed data and lifting data from a data storage unit, marking the wind speed data as FS, the lifting load as ZH, the maximum windward area of the load as YS, the preset lifting height as DH and the preset lifting speed as DV;
step S22: comparing the lifting load with a load limit value, when the lifting load is more than or equal to the load limit value, judging that the load exceeds and cannot be successfully lifted, generating a load overweight signal, and when the lifting load is less than the load limit value, judging that the load is normal, and performing no processing, and entering step S23;
step S23: substituting the wind speed data and the maximum windward area of the load into a calculation formula: obtaining windward thrust TF, wherein ρ represents air density and the value is 1.205kg/m3;
step S24: calculating the ratio of the windward thrust to the gravity of the lifted object, presetting a thrust-weight ratio threshold in an early warning analysis unit, judging that the wind power influence is controllable when the ratio result is smaller than or equal to the thrust-weight ratio threshold, entering a step S25, judging that the wind power influence is uncontrollable when the ratio result is larger than the thrust-weight ratio threshold, and generating a wind power alarm signal;
step S25: distance formula according to free falling body movementSubstituting a preset lifting height into a distance formula to obtain free falling time t Falling down Wherein g is the gravity acceleration, substituting windward thrust and lifting load into the calculation formula: windward thrust = lifting load =acceleration, resulting inTangential acceleration a;
step S26: under extreme conditions, after a lifted cable is broken, a lifted object can perform uniform variable-speed linear motion along the tangential direction of the lifting speed at windward thrust, and free falling time, tangential acceleration and lifting speed are substituted into a calculation type:thereby obtaining the horizontal displacement JL of the lifted object after fracture;
step S27: drawing a virtual circle by taking any point on a preset lifting track as a circle center and taking a distance represented by horizontal displacement as a radius, connecting the center with the circle center by taking the bottom of a crane cantilever as the center, extending to intersect with the far-end outline of the circle, marking an intersection point, taking the distance between the center and the intersection point as the radius, taking the center point as the center of an early warning area, establishing a circular area, and integrating the center coordinate point and the radius of the early warning area into early warning area data.
The regional warning unit comprises a plurality of infrared generators and infrared receivers with equal numbers, the infrared generators and the infrared receivers are arranged on the boundary of a circular early warning region at equal intervals, and the specific steps of regional warning are as follows:
step S31: when the crane is started, the infrared generator transmits infrared rays to the corresponding infrared receiver to form an infrared induction light curtain, so that the early warning area is separated from the external space;
step S32: when the infrared generator works and the corresponding infrared receiver can receive infrared light, no invasion is judged in the early warning area, no processing is carried out, and when the infrared generator works and the corresponding infrared receiver does not receive infrared light, an invasion target appears in an infrared induction light curtain in the early warning area, and a safety early warning signal is generated;
step S33: when the safety early warning signal is identified, a camera is started to acquire a face image, the acquired face image is converted into face image data, commander image data are extracted from a data storage unit and are compared with face influence data, when the comparison is successful, an invasion target is judged to be a ground commander, a safety prompt signal is generated, when the comparison is failed, the invasion target is judged to be a strange target, and a safety warning signal is generated;
step S34: when the safety prompt signal is recognized, no processing is performed, and when the safety alarm signal is recognized, the crane operator is prompted by voice to stop operation, and meanwhile, the ground commander is informed to warn and drive away strange targets.
The specific steps of the auxiliary correction unit for correction are as follows:
step S41: obtaining cable length data, load lifting time and load descending time, carrying out difference operation on the cable length data at the initial moment of the load lifting time and the cable length data at the final moment of the load lifting time to obtain a length difference value, obtaining a load lifting speed according to the length difference value and the load lifting time, and obtaining the load descending speed in the same way;
step S42: the auxiliary correction unit is preset with a vibration frequency limit value and a stability threshold value, and according to a calculation formula:when the stability coefficient is within the stability threshold, not performing any processing, and when the stability coefficient is outside the stability threshold, performing load lifting or load descending according to the current load lifting speed or the current load descending speed which is reduced by ten percent;
step S43: when the actual lifting speed is less than the preset lifting speed, acquiring a load-power-speed comparison table and real-time power, comparing to obtain a theoretical lifting speed, calculating the ratio of the real-time lifting speed to the theoretical lifting speed to obtain a speed ratio, judging that the current power-speed conversion efficiency is abnormal when the speed ratio is less than a set threshold value, generating a working condition abnormal signal, and when the actual lifting speed is more than the preset lifting speed, judging that the lifting speed is too high, and the actual lifting track exceeds the preset lifting track to generate a brake signal;
step S44: when the working vibration frequency is smaller than the vibration frequency limit value, no processing is performed, and when the working vibration frequency is larger than or equal to the vibration frequency limit value, the working condition of the crane is judged to be unstable, the reliability of the transmission connecting device is low, and a vibration checking signal is generated.
When the control unit recognizes the abnormal working condition signal and the vibration checking signal, the control unit sends out a corresponding prompt tone to remind a crane operator to stop the machine for checking, and when the control unit recognizes the braking signal, the control unit automatically sends out an electric signal to the driving unit to carry out deceleration correction.
The crane safety management control method comprises the following steps:
step one: the data acquisition unit acquires wind speed data, lifting data and supervision image data and transmits the data to the data storage unit for storage;
step two: the early warning analysis unit extracts wind speed data and lifting data from the data storage unit, calculates and obtains early warning area data by utilizing a theoretical formula, simultaneously generates a load overweight signal and a wind power alarm signal, sends out an audible and visual alarm after being identified by the control unit, simultaneously sends the early warning area data to the area warning unit, and the area warning unit is provided with an infrared generator and an infrared receiver to separate an early warning area from an external space and identify, warn and drive away targets invading the early warning area;
step three: in the process of lifting objects, the auxiliary correction unit obtains the load lifting speed and the load descending speed, compares the stability coefficient, reduces the load lifting speed or the load descending speed when the stability coefficient exceeds the stability threshold, simultaneously calculates and compares the actual lifting speed with the preset lifting speed, correspondingly generates a working condition abnormal signal and a brake signal, generates a vibration check signal through comparing the working vibration frequency with the vibration frequency limit value, and prompts a crane operator and performs stop check after the control unit recognizes the vibration check signal.
Working principle: when the crane monitoring system is used, firstly, the data acquisition unit acquires wind speed data, lifting data and supervision image data and transmits the wind speed data and the lifting data to the data storage unit for storage, the early warning analysis unit extracts the wind speed data and the lifting data from the data storage unit, the early warning area data is calculated by utilizing a theoretical formula, meanwhile, a load overweight signal and a wind warning signal are generated, the control unit sends out an acousto-optic warning after identification, meanwhile, the early warning area data is sent to the area warning unit, the area warning unit is provided with an infrared generator and an infrared receiver to separate the early warning area from an external space, the targets invading the early warning area are identified, warned and driven away, in the process of lifting objects, the auxiliary correction unit obtains the load lifting speed and the load descending speed, compares the stability coefficient, when the stability coefficient exceeds the stability threshold, reduces the load lifting speed or the load descending speed, meanwhile, calculates and compares the actual lifting speed and the preset lifting speed, correspondingly generates a working condition abnormal signal and a brake signal, and generates a vibration inspection signal through comparing the working vibration frequency with a vibration frequency limit value, and stops the crane inspection operator after the control unit identifies the crane.
In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and for simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, as well as a specific orientation configuration and operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (4)
1. A crane safety management control system is characterized in that: the system comprises a data acquisition unit, a control unit, an early warning analysis unit, an auxiliary correction unit, a data storage unit and an area warning unit;
the data acquisition unit is used for acquiring wind speed data and lifting data and transmitting the wind speed data and the lifting data to the data storage unit for storage, the lifting data comprises lifting load, maximum windward area of the load, preset lifting height, preset lifting speed and preset lifting track, and the preset lifting track represents a path track to be passed by an object from an initial point to a target point;
the data storage unit is pre-stored with specification data of the crane and commander image data, wherein the specification data comprises a load limit value, a load-power-speed comparison table and a vibration frequency limit value;
the early warning analysis unit is used for analyzing the early warning area to obtain a load overweight signal, a wind power alarm signal and early warning area data and sending the load overweight signal, the wind power alarm signal and the early warning area data to the control unit, and the control unit sends an audible and visual alarm when recognizing the load overweight signal and the wind power alarm signal, and meanwhile, the control unit sends the early warning area data to the area warning unit, and the area warning unit receives the early warning area data and warns the early warning area;
the data acquisition unit acquires cable length data, load lifting time and load descending time in real time, and the working vibration frequency, the real-time power and the actual lifting speed are transmitted to the auxiliary correction unit, and the auxiliary correction unit is used for correcting the operation of crane operators, obtaining working condition abnormal signals, brake signals and vibration check signals and transmitting the working condition abnormal signals, the brake signals and the vibration check signals to the control unit;
the early warning analysis unit performs early warning area analysis, specifically: judging the load and generating a load overweight signal, simultaneously calculating windward thrust according to wind speed data and the maximum windward area of the load, further calculating the ratio of the windward thrust to the gravity of the lifted object, further judging the influence degree of wind power and generating a wind power alarm signal, and calculating the furthest falling point of the lifted object after the lifted cable is broken through free falling body analysis, thereby establishing a circular early warning area;
the auxiliary correction unit is used for performing correction operation, and specifically comprises the following steps: the auxiliary correction unit obtains the stability coefficient through solving the load lifting speed and the load descending speed, compares the stability coefficient, reduces the load lifting speed or the load descending speed when the stability coefficient exceeds a stability threshold value, and simultaneously calculates and compares the actual lifting speed and the preset lifting speed, and correspondingly generates a working condition abnormal signal, a brake signal and a vibration checking signal.
2. The crane safety management control system according to claim 1, wherein the area warning unit comprises a plurality of infrared generators and infrared receivers with equal numbers, the infrared generators and the infrared receivers are arranged on the boundary of the circular early warning area at equal intervals, the infrared generators emit infrared light to the corresponding infrared receivers to form an infrared sensing light curtain, the early warning area is separated from an external space, when an intrusion target appears in the infrared sensing light curtain, whether the intrusion target is a ground commander is judged, when the intrusion target is confirmed to be a strange target, no processing is performed, and when the intrusion target is confirmed to be a strange target, the crane is stopped and warned and driven away.
3. The crane safety management control system according to claim 1, wherein when the control unit recognizes the abnormal working condition signal and the vibration inspection signal, the control unit sends out a corresponding prompt tone to remind a crane operator to perform stop inspection, and when the control unit recognizes the brake signal, the control unit automatically sends out an electric signal to the driving unit to perform deceleration correction.
4. The crane safety management control method is characterized by comprising the following steps of:
step one: the data acquisition unit acquires wind speed data, lifting data and supervision image data and transmits the data to the data storage unit for storage;
step two: the early warning analysis unit extracts wind speed data and lifting data from the data storage unit, calculates and obtains early warning area data by utilizing a theoretical formula, simultaneously generates a load overweight signal and a wind warning signal, sends out an audible and visual warning after being identified by the control unit, simultaneously sends the early warning area data to the area warning unit, and the area warning unit is provided with an infrared generator and an infrared receiver to separate an early warning area from an external space and identify, warn and expel targets invading the early warning area;
step three: in the process of lifting objects, the auxiliary correction unit obtains the load lifting speed and the load descending speed, compares the stability coefficient, reduces the load lifting speed or the load descending speed when the stability coefficient exceeds the stability threshold, simultaneously calculates and compares the actual lifting speed with the preset lifting speed, correspondingly generates an abnormal working condition signal and a braking signal, automatically sends an electric signal to the driving unit to carry out deceleration correction, generates a vibration checking signal through the comparison of the working vibration frequency and the vibration frequency limit value, and prompts a crane operator and carries out stop checking after the control unit recognizes the vibration checking signal.
Priority Applications (1)
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| CN115367627B (en) * | 2022-09-16 | 2023-11-14 | 江苏省特种设备安全监督检验研究院 | Crane safety monitoring method, system and storage medium based on Internet of things |
| CN117819388B (en) * | 2024-01-08 | 2024-06-11 | 宜昌泛海巨涛科技有限公司 | Portal crane stability evaluation system based on data analysis |
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